diff --git a/src/program-types.ts b/src/program-types.ts
index f0b18b102..c0b991dc7 100644
--- a/src/program-types.ts
+++ b/src/program-types.ts
@@ -335,7 +335,7 @@ export interface PlaceOrderEvent {
   orderId: anchor.BN;
   expiryTs: anchor.BN;
   asset: any;
-  margin_account: PublicKey;
+  marginAccount: PublicKey;
   clientOrderId: anchor.BN;
 }